Steam boiler and method of forming the same



- 1931. J. J. MA'YS 1,315,627

swam BOILER AND METHOD OF FORMING THE sum Filed April 14. 1950 2 Sheets-Sheet 1 REAR i i k 5 h I! q "a E u=m E lNVENTOR YJAMES J. MAYS J. J. MAYS July 21, 1931.

STEAM BOILER AND METHOD OF FORMING THE SAME Filed April 14. 1950 2 Sheets-Sheet 2 QOOOOOOOOOOO OOOOOOOOOOOOO WWI WW? ooooooooooooo oooooooooooo ooooooooooo s M Y W M mm atented 21, 1 931 UNITED STATES PATENT OFFICE JAMES J. HAYS, OF OIL CITY, PENNSYLVANIA, ASSIG-NOR TO OIL OITY BOILER WORKS, OF OIL CITY, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA STEAM BOILER AND METHOD OF FORMING THE SAME Application filed. April 14, 1930. Serial No. 443,852.

This invention relates to that type of a steam or hot water boiler which is generally designated as a heating boiler, because it is mostly used for supplying either steam or hot water under comparatively low pressures to the various members of the firebox of such boiler, and to the product thus produced.

The particular object of this invention is,

to provide a more easily and cheaply constructed and amore conveniently and econom- 16 ically assembled firebox than has heretofore been produced for this type of boiler, especially in the respect that its various members in comparison with the existing state of the art, are so shaped as to be more readily, quickly patterned or cut out, formed and united together toform the firebox member of the boiler.

My invention is clearly illustrated in the accompanying drawings in which:

Fig. l is a side elevation of a boiler embodying my invention with both ends shown in central, vertical section to clearly illustrate the assembly of the firebox.

Fig. 2 is an elevation of one of the main sheets of the firebox, before it is formed.

Fig. 3 is an elevation of a somewhat modified form of main sheet for the firebox before it is formed.

Fig. 4 is a front end view of the left hand member of the Fig. 2 form of said main sheet after the forming of same to produce Ehe crown of the left hand side of the fire- Fig. 5 is a front end view of the right hand section of the Fig. 2 form of said main sheet after the forming of same to produce the crown of the right hand side of the firebox.

Fig. 6 is a front end view of the left hand section of the Fig. 3 form of main sheet after it has been formed to produce the corresponding side of the crown of the firebox.

Fig. 7 is a front end view of the righthand section of the Fig. 3 form of main sheet after it has been formed to produce the corresponding side of the crown of the firebox.

Fig. 8 is a front end view of said main sheets of the Fig. 2 type after they have been joined or assembled together to form the side walls or shell of the firebox of the boiler.

Fig. 9 is a face view of the firebox tub-e sheet that is used with the Fig. 2 type of main sheet.

Fig. 10 is a face View of the firebox tube sheet that is used with the Fig. 3 form of main sheet.

Fig. 11 is a perspective view of the rear wall of the firebox.

As will readily be seen from an inspection of Fig. l of the drawings, the type of boiler to which this invention relates is provided with a main firebox 1 which terminates at its rearward end in an auxiliary combustion chamber 2, which extends above said main combustion chamber; said chamber 2 is provided with a front wall consisting of a tube sheetFig.' 9-through which the rearward, adjacent end of the tubes 4 extend into said chamber 2, and from whence they lead into the front smoke box 5, of the boiler; the rear smoke box is indicated by the ordinal 5'; forthe sake of brevity said chamber 2 will hereinafter be termed the tube chamber, or auxiliary combustion chamber.

Inasmuch as Fig. 1 of the drawings shows a boiler equipped with the form of my improved firebox which embodies the members or details illustrated in Figs. 2, 4, 5, 8, 9 and 11, the method of making this form will be first described, which method consists of the following steps in substantially, though not necessarily, the order enumerated.

Two sheets of boiler plate are cut to the pattern shown in Fig. 2, so as to delineate two members, namely, member A from which the main side wall of the firebox and combustion chamber and th ir crown, are formed. also member B, which forms theside wall of said tube or auxiliary chamber 2; section A of one of these two sheets, termed the left hand sheet, is rolled or curved to the right to form one half the crown of the combustion chamber, as shown in Fig. l; section A of the other one of said two sheets is curved to the left to form the other half of said crown as shown in Fig. 5; after said plates have been thus curved, the

free, longitudinal edges of said sections A are arranged in contact and said edges are welded together at 6, as indicated in Fig. 8, and when so united they constitute what is herein termed the firebox shell.

The flue sheet shown in Fig. 9 is then formed from a suitable boiler plate and is thereafter assembled with the main previously formed shell by placing its lower edges in the lower end of the kerf 7, and its opposite faces in contact with the adjacent edges of sections A and B respectively, whereupon said edges and faces are united together by the process of welding.

The rear combustion chamber wall 8-Fig. 11- is next formed; the width of which wall is equal to the distance between the sections B B as indicated at the dimension C in Fig. 8; the radius R of the outer face of said wall 8 is somewhat less than the radius R of the adjacent edge of section B, in order to form an outside welding ledge or inside corner at 9; after said wall has been formed as stated, it is assembled into the position shown in Fig. 1 and is firmly joined, leak-tightat all of its adjacent, contact-ing points with the related firebox and boiler shell.

l/Vhen a boiler employing the forms of plates shown in Figs. 3, G, 7, l0 and 11 is constructed the steps of the method of construction are the same as designated in the foregoing specification.

The only difference between these two constructions is in the length of the radius of the crown sheet. The radius of the crown sheets of Figs. 4 and 5 is half the inside width of the firebox and the center from which the radius is struck is within or above the bottom of the firebox, and because of this he crown sheet forms a semi-circle; whereas in Fig. 6 and 7 form of crown the radius upon which the crown is struck and formed is from three to four times as long as the previously designated radius and is without, and may be considerably below the bottom of the firebox.

T he front end of my improved firebox may be built in any suitable manner as for either hand firing or for the reception of a stoker.

It will be readily understood by those skilled in the art of boiler making that the steps of my process may be varied from the order given above, and in quantity production this would necessarily be so.

I claim the following:

1. The herein described method of constructing the main portion of a firebox structure of a boiler of the return tube type, e1nbodying a main combustion chamber and an auxiliary combustion chamber located at one end of and being an upward extension of said main combustion chamber, the component elements of which structure are, a plate to form the lefthand side wall and the corresponding half of the crown sheet of the firebox also the left hand side wall of said aux iliary combustion chamber, a plate to form the righthand side wall and the corresponding half of said crown sheet also the righthand side wall of said auxiliary combustion chamber, rear wall for said auxiliary combustion chamber, and a front wall for said chamber which latter wall forms a tube sheet for one end of one set of tubes, said method consisting of the following steps, namely, cutting said first mentioned plate to pattern, forming the lefthand half of the crown upon said plate, cutting the second mentioned plate to pattern, forming the righthand half of the crown upon said plate, forming a plate for said rear wall, forming a plate for said front wall, uniting the longitudinal edges of said crown so as to form the shell of the combustion chamber, securing said front wall in position in said shell, and, uniting the edges of said rear wall with the contacting faces of said shell walls and said front wall.

2. The herein described method of producing the firebox structure of a boiler of the type specified, which method is carried out by the employment of the following steps, namely; cutting two pieces of boiler plate to pattern so as to delineate two sections or members, one of which sections is to form the side wall and one half the crown sheet of the firebox and the other section to form the side wall of an auxiliary combustion chamber located at one end of and extending above said crown; bending the crown section of one of said plates to form the left hand portion of said crown; bending the corresponding section of the other plate to form the right hand portion of said crown uniting the free, longitudinal edges of said crown portions whereby the main shell of the firebox is formed so as to have at each side of one end an upwardly extending side wall for said auxiliary chamber; forming a tube sheet for the front wall of said chamber; attaching said tube sheet to the front edge and the adjacent rear edge of said chamber and firebox sections; forming a rear wall for said auxiliary chamber; attaching the lateral and top edges of said rear wall to the rear edges of said side Walls and the top edge of said tube sheet.

3. The herein described method of forming the firebox and auxiliary combustion chamber of a boiler of the type specified, which method is carried out by the employment of the following steps, namely; cutting two pieces of boiler plate to pattern so as to delineate upon each plate two sections, one of said sections being adopted to form the side wall and one half the crown of the firebox and the other section to form the side wall of an auxiliary combustion chamber located at one end of and extending above said crown, a portion of which delineation consists of a kerf dividing a portion of one of said sections from the other; bending the crown section of one of said plates to form the lefthand portion of said crown; bending the corresponding portion of the other of said plates to form the righthand portion of said crown; uniting the longitudinal free edges of the crown sections so bent to form the main walls of a firebox having at each side of one end thereof an upwardly extending side wall of said auxiliary chamber; forming a tube sheet for the front wall of said combustion chamber; attaching said tube sheet in its position by placing its lower edge in said kerf and uniting the contacting edges or" the adjacent sections to their respective faces of said tube sheet; forming a rear wall for said combustion chamber; attaching the lateral and top edges of said rear wall to the rear edges of said side walls and the top edge of said tube sheet.

4. In a steam boiler of the return tube type an organization which forms the major portion of the firebox and a combustionchamber extension therefor which organization consists of; a plate which forms one side of said firebox and the adjacent half of the crown sheet also the corresponding side of the combustion chamber; a plate which forms the other side of the firebox and the adjacent half of the crown sheet also the corresponding side of the combustion chamber; a plate forming the rear and top walls of said combustion chamber and a tube-sheet plate forming the front wall of said combustion chamber, all of said plates being suitably united at their respective contacting edges and/or faces by the process of welding.

In testimony whereof I afiix my signature.-

JAMES J. MAYS. 

